{"id":"https://openalex.org/W2077315911","doi":"https://doi.org/10.1109/jcn.2004.6596577","title":"Butterfly Log-MAP decoding algorithm","display_name":"Butterfly Log-MAP decoding algorithm","publication_year":2004,"publication_date":"2004-09-01","ids":{"openalex":"https://openalex.org/W2077315911","doi":"https://doi.org/10.1109/jcn.2004.6596577","mag":"2077315911"},"language":"en","primary_location":{"id":"doi:10.1109/jcn.2004.6596577","is_oa":false,"landing_page_url":"https://doi.org/10.1109/jcn.2004.6596577","pdf_url":null,"source":{"id":"https://openalex.org/S173102057","display_name":"Journal of Communications and Networks","issn_l":"1229-2370","issn":["1229-2370","1976-5541"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310319808","host_organization_name":"Institute of Electrical and Electronics Engineers","host_organization_lineage":["https://openalex.org/P4310319808"],"host_organization_lineage_names":["Institute of Electrical and Electronics Engineers"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Journal of Communications and Networks","raw_type":"journal-article"},"type":"article","indexed_in":["crossref"],"open_access":{"is_oa":false,"oa_status":"closed","oa_url":null,"any_repository_has_fulltext":false},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5101996821","display_name":"Jia Hou","orcid":"https://orcid.org/0000-0001-6530-1769"},"institutions":[{"id":"https://openalex.org/I80611190","display_name":"Jeonbuk National University","ror":"https://ror.org/05q92br09","country_code":"KR","type":"education","lineage":["https://openalex.org/I80611190"]}],"countries":["KR"],"is_corresponding":false,"raw_author_name":"Jia Hou","raw_affiliation_strings":["Institute of Information &#x0026; Communication, Chonbuk National University, Chonju, 561-756, Korea","Institute of Information and Communication, Chonbuk National University, Chonju 561-756, Korea#TAB#"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Institute of Information &#x0026; Communication, Chonbuk National University, Chonju, 561-756, Korea","institution_ids":["https://openalex.org/I80611190"]},{"raw_affiliation_string":"Institute of Information and Communication, Chonbuk National University, Chonju 561-756, Korea#TAB#","institution_ids":["https://openalex.org/I80611190"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5034971703","display_name":"Moon Ho Lee","orcid":"https://orcid.org/0000-0002-8435-8557"},"institutions":[{"id":"https://openalex.org/I80611190","display_name":"Jeonbuk National University","ror":"https://ror.org/05q92br09","country_code":"KR","type":"education","lineage":["https://openalex.org/I80611190"]}],"countries":["KR"],"is_corresponding":false,"raw_author_name":"Moon Ho Lee","raw_affiliation_strings":["Institute of Information &#x0026; Communication, Chonbuk National University, Chonju, 561-756, Korea","Institute of Information and Communication, Chonbuk National University, Chonju 561-756, Korea#TAB#"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Institute of Information &#x0026; Communication, Chonbuk National University, Chonju, 561-756, Korea","institution_ids":["https://openalex.org/I80611190"]},{"raw_affiliation_string":"Institute of Information and Communication, Chonbuk National University, Chonju 561-756, Korea#TAB#","institution_ids":["https://openalex.org/I80611190"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5111826331","display_name":"Chang Joo Kim","orcid":null},"institutions":[{"id":"https://openalex.org/I142401562","display_name":"Electronics and Telecommunications Research Institute","ror":"https://ror.org/03ysstz10","country_code":"KR","type":"facility","lineage":["https://openalex.org/I142401562","https://openalex.org/I2801339556","https://openalex.org/I4210144908","https://openalex.org/I4387152098"]}],"countries":["KR"],"is_corresponding":false,"raw_author_name":"Chang Joo Kim","raw_affiliation_strings":["Radio technology research group of ETRI, Korea"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Radio technology research group of ETRI, Korea","institution_ids":["https://openalex.org/I142401562"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":2,"corresponding_author_ids":[],"corresponding_institution_ids":[],"apc_list":null,"apc_paid":null,"fwci":0.0,"has_fulltext":false,"cited_by_count":0,"citation_normalized_percentile":{"value":0.14312896,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":null,"biblio":{"volume":"6","issue":"3","first_page":"209","last_page":"215"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10125","display_name":"Advanced Wireless Communication Techniques","score":0.9998000264167786,"subfield":{"id":"https://openalex.org/subfields/2208","display_name":"Electrical and Electronic Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},"topics":[{"id":"https://openalex.org/T10125","display_name":"Advanced Wireless Communication Techniques","score":0.9998000264167786,"subfield":{"id":"https://openalex.org/subfields/2208","display_name":"Electrical and Electronic Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T11321","display_name":"Error Correcting Code Techniques","score":0.9994999766349792,"subfield":{"id":"https://openalex.org/subfields/1705","display_name":"Computer Networks and Communications"},"field":{"id":"https://openalex.org/fields/17","display_name":"Computer Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T12162","display_name":"Cellular Automata and Applications","score":0.9937999844551086,"subfield":{"id":"https://openalex.org/subfields/1703","display_name":"Computational Theory and Mathematics"},"field":{"id":"https://openalex.org/fields/17","display_name":"Computer Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.8103358745574951},{"id":"https://openalex.org/keywords/butterfly","display_name":"Butterfly","score":0.7892300486564636},{"id":"https://openalex.org/keywords/decoding-methods","display_name":"Decoding methods","score":0.7557503581047058},{"id":"https://openalex.org/keywords/turbo-code","display_name":"Turbo code","score":0.7379596829414368},{"id":"https://openalex.org/keywords/algorithm","display_name":"Algorithm","score":0.6256510019302368},{"id":"https://openalex.org/keywords/turbo-equalizer","display_name":"Turbo equalizer","score":0.4602367877960205},{"id":"https://openalex.org/keywords/computation","display_name":"Computation","score":0.4559330642223358},{"id":"https://openalex.org/keywords/turbo","display_name":"Turbo","score":0.4511442184448242},{"id":"https://openalex.org/keywords/serial-concatenated-convolutional-codes","display_name":"Serial concatenated convolutional codes","score":0.4191935062408447},{"id":"https://openalex.org/keywords/theoretical-computer-science","display_name":"Theoretical computer science","score":0.3358990550041199},{"id":"https://openalex.org/keywords/concatenated-error-correction-code","display_name":"Concatenated error correction code","score":0.23115018010139465},{"id":"https://openalex.org/keywords/block-code","display_name":"Block code","score":0.07705402374267578}],"concepts":[{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.8103358745574951},{"id":"https://openalex.org/C2778605236","wikidata":"https://www.wikidata.org/wiki/Q1018085","display_name":"Butterfly","level":2,"score":0.7892300486564636},{"id":"https://openalex.org/C57273362","wikidata":"https://www.wikidata.org/wiki/Q576722","display_name":"Decoding methods","level":2,"score":0.7557503581047058},{"id":"https://openalex.org/C114504821","wikidata":"https://www.wikidata.org/wiki/Q2164281","display_name":"Turbo code","level":3,"score":0.7379596829414368},{"id":"https://openalex.org/C11413529","wikidata":"https://www.wikidata.org/wiki/Q8366","display_name":"Algorithm","level":1,"score":0.6256510019302368},{"id":"https://openalex.org/C12232224","wikidata":"https://www.wikidata.org/wiki/Q7853840","display_name":"Turbo equalizer","level":5,"score":0.4602367877960205},{"id":"https://openalex.org/C45374587","wikidata":"https://www.wikidata.org/wiki/Q12525525","display_name":"Computation","level":2,"score":0.4559330642223358},{"id":"https://openalex.org/C2776240298","wikidata":"https://www.wikidata.org/wiki/Q1138513","display_name":"Turbo","level":2,"score":0.4511442184448242},{"id":"https://openalex.org/C33529081","wikidata":"https://www.wikidata.org/wiki/Q18378194","display_name":"Serial concatenated convolutional codes","level":5,"score":0.4191935062408447},{"id":"https://openalex.org/C80444323","wikidata":"https://www.wikidata.org/wiki/Q2878974","display_name":"Theoretical computer science","level":1,"score":0.3358990550041199},{"id":"https://openalex.org/C78944582","wikidata":"https://www.wikidata.org/wiki/Q5158264","display_name":"Concatenated error correction code","level":4,"score":0.23115018010139465},{"id":"https://openalex.org/C157125643","wikidata":"https://www.wikidata.org/wiki/Q884707","display_name":"Block code","level":3,"score":0.07705402374267578},{"id":"https://openalex.org/C162324750","wikidata":"https://www.wikidata.org/wiki/Q8134","display_name":"Economics","level":0,"score":0.0},{"id":"https://openalex.org/C10138342","wikidata":"https://www.wikidata.org/wiki/Q43015","display_name":"Finance","level":1,"score":0.0},{"id":"https://openalex.org/C127413603","wikidata":"https://www.wikidata.org/wiki/Q11023","display_name":"Engineering","level":0,"score":0.0},{"id":"https://openalex.org/C171146098","wikidata":"https://www.wikidata.org/wiki/Q124192","display_name":"Automotive engineering","level":1,"score":0.0}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1109/jcn.2004.6596577","is_oa":false,"landing_page_url":"https://doi.org/10.1109/jcn.2004.6596577","pdf_url":null,"source":{"id":"https://openalex.org/S173102057","display_name":"Journal of Communications and Networks","issn_l":"1229-2370","issn":["1229-2370","1976-5541"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310319808","host_organization_name":"Institute of Electrical and Electronics Engineers","host_organization_lineage":["https://openalex.org/P4310319808"],"host_organization_lineage_names":["Institute of Electrical and Electronics Engineers"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Journal of Communications and Networks","raw_type":"journal-article"}],"best_oa_location":null,"sustainable_development_goals":[],"awards":[],"funders":[],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":11,"referenced_works":["https://openalex.org/W2086670718","https://openalex.org/W2106044622","https://openalex.org/W2121606987","https://openalex.org/W2127299573","https://openalex.org/W2141619954","https://openalex.org/W2146694142","https://openalex.org/W2147762969","https://openalex.org/W2162180365","https://openalex.org/W2169335080","https://openalex.org/W2987657883","https://openalex.org/W6681798843"],"related_works":["https://openalex.org/W2161351338","https://openalex.org/W2031266772","https://openalex.org/W4287740435","https://openalex.org/W2103764150","https://openalex.org/W1925052465","https://openalex.org/W2126450554","https://openalex.org/W2116478666","https://openalex.org/W1503126716","https://openalex.org/W1980604010","https://openalex.org/W2170762214"],"abstract_inverted_index":{"In":[0],"this":[1],"paper,":[2],"a":[3,21,32],"butterfly":[4,34],"Log-MAP":[5],"decoding":[6],"algorithm":[7,52],"for":[8],"turbo":[9,17,40],"code":[10],"is":[11],"proposed.":[12],"Different":[13],"from":[14],"the":[15,26,45,50,57],"conventional":[16,48],"decoder,":[18],"we":[19],"derived":[20],"generalized":[22],"formula":[23],"to":[24],"calculate":[25],"log-likelihood":[27],"ratio":[28,65],"(LLR)":[29],"and":[30,59],"drew":[31],"modified":[33],"states":[35],"diagram":[36],"in":[37],"8-states":[38],"systematic":[39],"coded":[41],"system.":[42],"By":[43],"comparing":[44],"complexity":[46],"of":[47],"implementations,":[49],"proposed":[51],"can":[53],"efficiently":[54],"reduce":[55],"both":[56],"computations":[58],"work":[60],"units":[61],"without":[62],"bit":[63],"error":[64],"(BER)":[66],"performance":[67],"degradation.":[68]},"counts_by_year":[],"updated_date":"2025-11-06T03:46:38.306776","created_date":"2025-10-10T00:00:00"}
